I am a 27 year old male and i am having trouble keeping an erection. the problem only comes along when we get to the intercourse part of it during foreplay i don't seem to have this problem. over the past year this has gotten worse it seem like wants i go in for penetration thats when it all goes downhill (pardon the pun ) i get this mental thing going on to where if i don't enter on the first try thats when i lose it and sometimes just the thought of me thinking of losing it stops me. iv e been with my girlfriend three months now and don't want to lose her because i cant perform what can i do?